Cloth pressure mechanism for takeup rolls



March 17,1942. A. PALMER CLOTH PRESSURE MECHANISM FOR TAKE-UP ROLLSFiled Feb. 21, 1941 INVENTOR ALBERT PRLMER- 5L4 4. Mug

Patented Mar. 17, 1942 CLOTH PRESSURg MECHANISM FOR TAKE- P ROLLS AlbertPalmer, Worcester, Mass, assignor to Crompton & Knowles Loom Works,Worcester, Mass, a corporation of Massachusetts Application February 21,1941, Serial No. 379,912

11 Claims.

This invention relates to take-up mechanisms for looms and it is thegeneral object of the invention to prevent relative slippage of thecloth with respect to the take-up roll when the lay beats up.

That part of the cloth which extends for several inches in front of thereed tends to contract and ordinarily is of less width than the clothfell. Temples are customarily employed to stretch the cloth to preventtoo great a shrinkage and thereby reduce the lateral wearof the warpthreads against the reed dents. The part of the fabric in front of thetemples is held taut when the lay is in rear position, but responds tothe tendency to contract when slackened by the lay beat-up. If thiscontraction is considerable there is an objectionable relative slidingof the cloth along the take-up roll in the direction of the length ofthe latter, and when fine yarns such as rayon are employed this slidingcauses sufficient abrasion to break the fine yarns and reduce the valueof the cloth. It is an important object of my present invention toprovide means for preventing this lateral slippage of the fabric bymeans of a pressure roll or unit which will hold the cloth tightlyagainst the take-up roll.

At beat-up the slackness temporarily producedv in the fabric also has atendency to lessen the grip or hold which the take-up roll has on thecloth and there is a slight forward angular motion of the latter withrespect to the take-up roll. When the reed moves rearwardly the cloth isagain tightened to cause a relative rearward motion of the cloth withrespect to the take-up roll. This back and forth motion also contributesto the abrasion of line yarns and it is another object of my presentinvention to provide means for holding cloth in close contact with thetakeup roll during beat-up.

It is a further object of my present invention to provide a pressureroll or unit adjustable as to length for the accommodation of fabrics ofdifferent widths.

With these and other objects in view which will appear as thedescription proceeds, my invention resides in the combination of partshereinafter described and set forth.

In the accompanying drawing, wherein two forms of the invention are setforth,

Fig. 1 is a front elevation of a loom having the preferred form of theinvention applied thereto,

Fig. 2 is a vertical section on line 2-2 of Fig. 1,

Fig. 3 is an enlarged plan view in the direction of arrow 3, Fig. 1,

Fig. 4 is an enlarged detailed vertical section on line 4-4 of Fig. 3,

Fig. 5 is a vertical section on line 5-5 of Fig- 3.

Fig.6 is a vertical section on line 6-6 of Fig. 4, and

Fig. 7 is a view similar to Fig. 5 but showing a modified form of theinvention.

Referring to the drawing, the loomsides l and H are connected by abreast beam l2 preferably of angular section and'having top and sidewebs l3 and I4, respectively. A take-up roll l having a roughenedsurface [6 extends across the loom and has its ends supported inbrackets l1 secured to the loom-sides. These brackets also support rearand bottom guide rolls I8 and 19, respectively. In the bottom of theloom is mounted a cloth roll on which is wound the fabric F.

Any approved form of driving mechanism, designated generally at D inFig. 1, can be employed for effecting gradual rotation of the take-uproll in the direction of arrow a, Fig. 2 and also for causing rotationof the cloth roll in a direction to wind thereon the fabric receivedfrom the takeup roll. .The breast beam may have secured thereto a clothguide bar 2| which extends across the loom. v

The loom will be provided at each side with a temple T one of which isshown in Fig. 3. The temple has a foot held adjustably with respect tothe width of the loom on a bracket 26 secured to the breast beam andextending under the cloth being woven. The reciprocating bar 21customarily used in temples has projecting laterally therefrom a head 28in which is mounted the burr or pod 29 the effect of which is to stretchthe cloth at a point near the fell.

A lay 30 is reciprocated horizontally by connectors one of which isshown at 3| in Fig. 2. In the present instance the lay is shown as beingprovided with a series of shuttle boxes 32 which may be moved verticallywith respect to the lay to render any one of several weaving shuttlesactive but these shuttle boxes are not necessary. The lay is providedwith a reed B through which extend the warp threads W.

When the lay is in the front center position indicated in Fig. 3 thereed R will be against the fell of the cloth and the latter will betemporarily slackened and will move forwardly due to the pressureexerted by the'reed when beating the last laid pick of filling into thecloth. As

' the lay recedes the cloth has a slight rearward motion to be inposition for the next beat-up. The amount of this back and forth motionof the fell of the cloth varies with different fabrics but will berelatively large in the weaving of those fabrics to which my inventionmore particularly applies.

The cloth extends forwardly from the reed and templeover the bracket 26and guide bar 2| to the take-up roll, where it engages the roughenedsurface l6 and extends partly around'the latter tightens the selvagesare moved slightly in an outward direction and there is therefore acontinuing lateral motion of the selvage first toward and then away fromthe center of the loom. During beat-up the accompanying slackening ofthe fabric results in a slight reduction in the pressure between thecloth and the surface l6 and the fabric tends to move forwardly slightlywith respect to the roll.

In carrying my present invention into effect I provide a pressure unitfor maintaining the fabric, or at least the selvages thereof, in contactwith the take-up roll to prevent the continually recurring slackening ofthe fabric from causing slippage of the cloth along the roughenedsurface I6. The pressure unit itself is the same in both the preferredand modified forms of the invention and includes a rod extending acrossthe loom above the take-up roll and having attached at each end thereofa pressure roll or cylinder 4| which may be a hollow metal shell. Whenthe cloth being woven is relatively wide the shells will be in anoutwardly adjusted position with respect to the rod butwhen the cloth isnarrow the shells will be moved along the rod toward the center of theloom. The shells at both ends of the rod are the same and a descriptionof one of them will sufiice for both.

The inner end of cylinder 4| receives a collar 42 having an internaltapered surface 43 having its lesser diameter toward the center of theloom. A sleeve 44 inside the collar has a close fit with the rod 40 andis provided with a tapered surface 45 which engages the taper 43, andthere is extending inwardly from the sleeve a threaded shank 46 on whichis screwed a nut 41. The collar 42 is split longitudinally as at 48, seeFig. 6, while the sleeve 44 has a corresponding split 49, these splitspermitting slight expansion of the two parts. When the proper positionfor the shell 4| with respect to rod 40 is determined the nut 41 will betightened to draw the sleeve 44 toward the center of the loom andthereby expand the collar 42 and compress sleeve 44, thereby causingtthe rod 40, sleeve 49, collar 42 and shell 4| to be held togethertightly with respect to each other. A key 55 prevents relative turningof collar 44 or rod 40.

The outer end of the shell 4| has secured therein a plug from whichprojects a trunnion and also the take-up roll. It is to be understoodthat there will be a carrier arm 60 at each end of the pressure unit andthat the springs 62 cooperate to hold the pressure unit in such aposition that both selvages are forced tightly against the bar 2| andthe take-up roll. The bar 2| is ordinarily smooth, being formed ofpolished metal, but the friction surface of the shells 4| will serve toprevent any appreciable movement 5| by means of which the pressure unitis supported. The shell may be provided with a friction surface 52formed of any approved material, such as rubber, felt, or the like.

In the preferred form of the invention I provide a mounting for each endof the pressure unit which will hold it against the bar 2| and thetake-up roll. As shown in Fig. 5 a carrier arm BI! is pivoted on theadjacent gudgeon 5| and has the lower end thereof attached as at 6| to arelatively heavy tension spring 62 the lower end of which is attached asat .63 to a clip 64 preferably of angular form and having a frontupwardly projecting finger held tightly against the lower frictionsurfaces in contact with the cloth of the fabric along the bar 2| towardthe center of the loom when the loom beats up. The fabric is held inclose contact with the frictional surface of the pressure unit which isadditional to the roughened surface l6 and. these two surfaces cooperateto prevent motion of the selvage toward the center of the loom. Thepressure unit is free to rotate on the carriers as the cloth advances.

In the modified form of the invention ;the pressure unit has nocooperation with the bar 2| but is held in such position as to engagethe cloth substantially at the point of tangency between the fabric andthe take-up roll. In this form of the invention each end of the rollwill have its gudgeon 5| received by the rear end H of a carrier 12 inthe upper face of which is a concave pocket 13 to contact the forwardand under surface of a portion of the bar 2|. A rearwardly anddownwardly extending arm 15 of the carrier has projecting upwardlytherethrough the stem 16 of an adjusting screw 11 having a shoulder 18between which and the arm 15 is a compression spring 19. The screw 11 isthreaded into a bracket which is held as by bolt 8| to the vertical webM of the breast beam, and can be adjusted to vary the pressure of theshells 4| on the cloth.

In the modified form of the invention the distance between the gudgeon5| and the bar 2| as determined by the length of forward arm ll of thecarrier will maintain the shells and their approximately as shown inFig. '7.

In the preferred form of the invention the loom will slacken the fabricperiodically as already set forth but the fabric will be held againstlateral motion toward the center of the loom by the pressure unit whichengages the cloth at the bar 2| and also the take-up roll. In themodified form of the invention the lateral motion of the fabric canoccur along the bar 2| which is smooth but is prevented with respect tothe takeup roll. In both forms of the invention the pressure unitprovides a friction surface additional to that of the take-up roll toassist in holding the cloth spread to its full width, and in both formsthe fabric is prevented from moving laterally with respect to thetake-up roll and also from becoming slackened sufficiently to slipangularly along the latter at the time of beat-up.

From the foregoing it will be seen that I have provided a simple meansfor preventing lateral and angular slippage of the selvages of thefabrics with respect to the take-up roll. It will be further be seenthat the shells on the end of the bar 40 can be adjusted to accommodatefabrics of varying widths.

Having thus described my invention it will be seen that changes andmodifications may be made therein by those skilled in the art without;departing from the spirit and scope of the invention and I do not wishto be limited to the details herein disclosed. Herein I claim thespecific form of my invention shown in Fig. 2, and claim the specificstructure shown in Fig. '7 in a divisional application Serial No.390,738, filed April 28, 1941.

What I claim herein is:

1. In a loom having a take-up roll to which the woven fabric extendsfrom the weaving point to a line of tangency extending along the upperpart of the roll, a pressure unit above the takeup roll having a,surface in contact with the cloth, and means attached to the unit forforcing the surface of the unit downwardly against the cloth to hold thelatter against the take-up roll along said line of tangency.

2. In a loom having a breast beam and a rotating take-up roll to whichthe cloth extends from the breast beam to a line of tangency extendingalong the take-up roll, a rotatable pressure unit located over the clothand extending along that part of the take-up roll over which the clothselvage passes, and means to hold the pressure unit in close contactwith the cloth to force the latter against the take-up roll along saidline of tangency.

3. In a loom having a breast beam and a rotating take-up roll to whichthe cloth extends from the breast beam to a line of tangency extendingalong the take-up roll, a rotatable pressure unit located overv thecloth and extending along that part of the take-up roll over which thecloth selvage passes, and continuously acting means connected to thebreast beam to hold the pressure unit in close contact with the cloth toforce the latter against the take-up roll along said line of tangency.

4. In a loom having a breast beam and a rotating take-up roll to whichthe cloth extends from the breast beam to a line of tangency extendingalong the take-up roll, a rotatable pressure unit having a frictionsurf-ace located over the cloth and extending along that part of thetake-up roll over which the cloth selvage passes, and means acting onthe pressure unit to hold the friction surface thereof in close contactwith the cloth to force the latter against the take-up roll along saidline of tangency.

5. In a loom provided with a cloth guide bar and a take-up roll spacedfrom and in front of the bar, the cloth extending over and in contactwith the bar to the take-up roll, a pressure unit having a frictionsurface over those parts of the bar and take-up roll over which thecloth selvage passes, and means to hold the unit with the frictionsurface thereof in close contact with the cloth thereunder at pointsabove the bar and take-up roll and also that part of the cloththereunder extending between the bar and takeup roll.

6. In a loom having a breast beam provided with a cloth guide bar and atake-up roll spaced from and in front of the bar, the cloth extendingover and in contact with the bar to the take-up roll, a pressure unithaving a friction surface over those parts of the bar and take-up rollover which the cloth selvage passes, and means connected to the breastbeam to hold the unit with the friction surface thereof in close contactwith the cloth thereunder at points above the bar and take-up roll andalso that part of the cloth thereunder extending between the bar andtake-up roll.

7. In a loom provided with a cloth guide bar and a take-up roll spacedfrom and in front of the bar, the cloth extending over and in contactwith the bar to the take-up roll, a pressure unit over those parts ofthe bar and take-up roll over which the cloth selvage passes, and meansto hold the unit in close contact with the cloth thereunder at pointsabove the bar and takeup roll and also that part of the cloth thereunderextending between the bar and take-up roll.

8. A cloth pressure unit for a loom having a take-up roll and bearingmeans, said unit comprising an elongated rod to be located over thetake-up roll, a pair of cylinders having friction surfaces, one cylinderfor each end of the rod, trunnions extending from the cylinders forcooperation with the bearing means, and means to hold each cylinder tothe adjacent end of the rod in any one of a plurality of longitudinallyadjusted positions.

9. A cloth pressure unit for a loom having a take-up roll and bearingmeans, said unit comprising an elongated rod to be located over thetake-up roll, a pair of cylinders having friction surfaces, one cylinderfor each end of the rod, tr unnions extending from the cylinders forcooperation with the bearing means, and means to hold each cylinder tothe adjacent end of the rod in any one of a plurality of longitudinallyadjusted positions, said last named means including a split collarengaging the interior of the cylinder, a shell on the rod, said collarand shell having mutually engaging inclined surfaces, and means on theshell to engage the collar to cause relative longitudinal motion of thecollar and shell with. respect to the rod to eifect expansion of thecollar to cause clamping of the latter against the cylinder, whereby therod, the shell, the collar and the cylinder may be made rigid withrespect to each other at any one of the plurality of points along therod.

10. In a cloth pressure unit for a loom having a take-up roll andbearings for the unit, said unit comprising an elongated rod to extendalong and above the take-up roll, said unit comprising also acylindrical shell at each end of the rod provided with an externalfriction surface, each shell having a trunnion to be received by thecorresponding bearing, and means within each shell and surrounding therod capable of being clamped to the shell and rod in any one of aplurality of relative positions of the shell with respect to the rod.

11. In a cloth pressure unit for .a loom having a take-up roll andbearing means, said pressure unit comprising an elongated rod to belocated above the take-up roll and having a cylinder at each end of therod from which projects a, trunnion for the bearing means, a pair ofmutually engaging elements for each cylinder, one element engaging therod and the other element engaging the inteorior of the cylinder andsaid elements having mutually engaging inclined surfaces, and means tocause relative motion of the inclined surfaces to effect expansion ofone of the elements to clamp said elements and associated cylinder tothe adjacent end of the rod.

ALBERT PALMER.

